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首页> 外文期刊>Catalysis science & technology >Hydrogen production by ammonia decomposition using high surface area Mo2N and Co3Mo3N catalysts
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Hydrogen production by ammonia decomposition using high surface area Mo2N and Co3Mo3N catalysts

机译：由氨分解制氢高表面积Mo2N Co3Mo3N催化剂

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摘要

High surface area bulk molybdenum nitride catalysts were synthesized via temperature-programmed ammonolysis of an ammonium heptamolybdate and citric acid (CA) composite. The synthesized materials were tested for COx-free H-2 production via ammonia decomposition for fuel cell application. Cobalt was added at different loadings (1, 3, and 5 wt%) as a promoter for the bulk molybdenum nitrides. The chemical composition and surface morphology of the nitride catalysts were studied by means of XRD, XPS, SEM-EDAX and TEM techniques. Addition of cobalt increased the formation of the gamma-Mo2N phase and cobalt existed as the Co3Mo3N phase, which was uniformly distributed over Mo2N as evidenced by TEM and SEM analyses. A drastic increase in Mo2N crystal size was observed when the Co loading exceeded 3 wt%, which in turn decreased the catalyst activity for ammonia decomposition reaction. All catalysts exhibit higher activity than the reported nitride catalysts at low temperatures. All catalysts showed stable activity for 30 hours. The activation energy calculated for ammonia decomposition was decreased drastically from 131.2 to 99 kJ mol(-1) by the addition of cobalt (1 wt%) in Mo2N preparation.
机译：高表面积体积氮化钼催化剂合成了通过程序升温铵的氨解作用heptamolybdate和柠檬酸(CA)复合材料。合成材料进行了测试通过氨分解COx-free 2生产燃料电池的应用。不同载荷(1、3和5 wt %)作为一个启动子的大部分钼氮化物。化学成分和表面形态氮化催化剂研究的XRD、TEM、XPS SEM-EDAX and技术。钴的增加的形成gamma-Mo2N阶段和钴的存在Co3Mo3N阶段,这是均匀分布的随着Mo2N TEM和SEM分析证明了这一点。Mo2N晶体尺寸急剧增加观察到当公司装载超过3 wt %,进而降低催化剂活性氨分解反应。表现出较高的活性比氮化报道催化剂在低温下。显示稳定的活动30小时。活化能计算出氨分解是大幅下降131.2到99 kJ摩尔添加钴(1)(1 wt %) Mo2N准备。

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